AP BIOLOGY

Detailed explanation-1: -Answer and Explanation: Diploid cells that undergo meiosis I to form two haploid secondary spermatocytes: primary spermatocyte. After the spermatogonium undergoes mitosis, the primary spermatocyte is formed, which undergoes meiosis I to form the two secondary spermatocytes.

Detailed explanation-2: -Primary spermatocyte undergoes meiosis-I & forms two secondary spermatocytes.

Detailed explanation-3: -Spermatocytes Undergo Meiosis In males, meiosis I occurs only in primary spermatocytes that are 4N, and this process is characterized by genetic recombination where the paternal homolog of each chromosome breaks and rejoins with its maternal homolog.

Detailed explanation-4: -The primary oocytes with tertiary follicles undergo meiosis I to form haploid secondary oocytes during menstruation cycle under the influence of pituitary hormones.

Detailed explanation-5: -Spermatogenesis begins with a diploid spermatogonium in the seminiferous tubules, which divides mitotically to produce two diploid primary spermatocytes. The primary spermatocyte then undergoes meiosis I to produce two haploid secondary spermatocytes.